Fuel trims, MAF/MAP Procedure Question

Im having trouble to follow your procedure of in my HP tuners window.

I was unable to locate the airflow vs period table under the speed density tab, and I looked thoroughly through the airflow tabs to find something similar. I understand my vehicle is not a ford truck and is a FORD Focus ST, but I am failing to see a similar method with what the options I have in the software. Are you familiar with reiterating this process on a 2018 Eco boost ECU? I was hoping they would be perfectly similar but there are some discrepancies.

Basically, in short, what's the best way to use the percentages of my STFT % corrections to readjust the air flow calibration? I cant find the appropriate table to use this process on.

Could you post an .HPT file from your ECU? We could then take a look and advise.

heres my hpt file

I don't envy you folks working with modern OEM ECUs without full documentation.

I agree there doesn't seem to be a MAF translation from frequency or period to Mass Air Flow. The section Engine->Airflow->Generarl->MAF Calibration is where I would expect to find a link to a table that you would adjust. Perhaps HPTuners has just not decoded this table, or not made it available due to the way the ECU operates.

I looked at your tune in VCM Editor, and it looks like this ECU is essentially in full-time closed loop mode. You can set the lambda targets for Wide Open Throttle (WOT), Under Engine->Fuel->Power Enrich->WOT Lambda (Gasoline) and WOT Lambda FFV (Flex Fuel), and I bet it does a real good job of hitting those targets.

Sorry I can't help more. I suspect your best support will come from the HPTuners Forum. Here is a search for "Focus ST", but some of those Ecoboost threads seem like they would be helpful.

https://forum.hptuners.com/search.php?searchid=6975890

Sounds like most tuning with this platform involves fixing torque limits (LPSI limits found under Engine->Torque Management->General) needs adjusting if you are adding power.

Good Luck, sorry I can't help more.

@David Ferguson,

Thank!!!! I'm sure this advice I find extremally helpful and I appreciate when you show me the step by step in clear print. this is perfect.

"MAF translation from frequency or period to Mass Air Flow. The section Engine->Airflow->Generarl->MAF Calibration"

Like I diont already have enough trouble learning the program jk

"Wide Open Throttle (WOT), Under Engine->Fuel->Power Enrich->WOT Lambda (Gasoline) ...."

Yes I think this could be something important, alothough a smaller chart. Ill figure something out IM sure , Yeah more hp tuners specialized blah blah application shortcut? idk. ThNKAS

DaVID,

What should I do with this powern richment table for WOT Lamba? MAX it out????

The coolant temperature of the eninge shouldnt dictate my lambda value coorect ?

Up to what extent should laMBA value influence ? Or rather...

How can I use this chart to avoid closed loop function ? Max It Out?

tahnnkknbyou